[solved] Dumping values in Vector Buffer

[akshay123]

I am new to Qt , currently developing an application which will parse a XML file and dump the values in the vector Buffer .

my XML file look like this

<Root>
<class name="ADC"      type="DWORD"  value="0xDEEDBEAF" />
<class name="BDC"      type="WORD"   value="0xEFCDEG" />
<class name="MDC"      type="BYTE"   value="0xEFCDEG" />
</Root>

we have one (uchar) vector (buffer) . where the values of the XML attributes needs to be dumped.

vector<uchar> buf;
The problem is that when we will get the value(0xDEEDBEAF,0xEFCDEG ...) of each attribute tag , QString is returned

QString value = classElement.attribute("value"); //Value is of type QString.
But i need to push the data in to (uchar) vector according to BYTE , WORD, DWORD .

i researched in the internet , but i am not able to get any good source of converting QString to BYTE , QString to WORD , QString to DWORD.

Any help to convert Qstring to BYTE,WORD,DWORD will be great help full. So that data can be pushed into uchar vector.

Thanks

Edit: Added code tags -- @Wieland

[jsulm]

@akshay123 After writing everything into this buffer, how do you know how to read it? I mean, how do you know whether you need to read DWORD, WORD or BYTE?
Your buffer will look like: [DE, ED, BE, AF, EF, CD, EG, EF, CD, EG]
Note: G is not valid hex number!
Why not use QByteArray?
To convert hex string to number use http://doc.qt.io/qt-5/qstring.html#toInt

[akshay123]

After writing on to buffer, We have another xml file which keeps tracks of indices , With the help of those indices we are going to read which is next element (WORD,DWORD or BYTE ) to be read . Yes G is not a valid Hex number , While posting there was a typo mistake .

[dheerendra]

In addition to what previous ans look at the documentation of qstring.There are so many functions like toascii() tolatin() tolocal8bit() etc. They should help you.

[akshay123]

@jsulm Thanks for your sugestion ,

Currently i have values like this

value="10"
value="11"
value="12"
value="13"
value="14"
value="15"
value="16"
value="07"

Those are in decimal . But when i tried to convert these to hex using Qstring.setnum( ). I am not able to get the hex values .

Thye code sniped it like this

QString value_SB = tempElement.attribute("value");
bool ok1;
int value_B1= value_SB.toInt(&ok1, 16);
QString hex_value;
hex_value.setNum(value_B1,16);
int result1 = hex_value.toInt(&ok1, 16);
buff.push_back((uchar)result1);

But the output is same 10 11 12 13

[jsulm]

@akshay123 Why do you want to convert to hex? There is no need for that.

[jsulm]

@akshay123 Just do toInt() as it is decimal

[akshay123]

@jsulm some numbers are in decimal format and some are hexadecimal .

I want all the numbers whould be in hexadecimal format

[jsulm]

@akshay123 Then you need to know which number is in which format: decimal 10 is not the same as 10 in hex.

[VRonin]

bool valueInVector(QString val,vector<uchar>& buf){
int base=10;
if(val.leftRef(2).compare("0x",QString::CaseInsensitive)==0){
base=16;
val.remove(0,2);
}
bool check=true;
for(int i=0;i<val.size() && check;i+=2){
const uchar tempVal=val.midRef(i,2).toUInt(&check,base);
if(check)
buf.push_back(tempVal);
}
return check;
}